For forwarded messages, sender of the original message

For messages forwarded from channels or from anonymous administrators, information about the original sender chat

For messages forwarded from channels, identifier of the original message in the channel

For forwarded messages that were originally sent in channels or by an anonymous chat administrator, signature of the message sender if present

Sender's name for messages forwarded from users who disallow adding a link to their account in forwarded messages

For forwarded messages, date the original message was sent in Unix time

True, if the message is a channel post that was automatically forwarded to the connected discussion group

For replies, the original message. Note that the Message object in this field will not contain further reply_to_message fields even if it itself is a reply.

Bot through which the message was sent

Date the message was last edited in Unix time

True, if the message can't be forwarded

Signature of the post author for messages in channels, or the custom title of an anonymous group administrator

Inline keyboard attached to the message. login_url buttons are represented as ordinary url buttons.